James p



(N0 M0del.)

J.- P. ROE.

YOKE FOR MANHOLE COVERS.

Patented June 19, 1894.

UNITED I STATES PATENT ()FFICE.

JAMES P. ROE, or POTTSTOWN, PENNSYLVANIA.

YOKE. FORKMANHOLE-COVERS.

SPECIFICATION forming part of Letters Patent No, 521,732, dated June 19,1894. I

Application filed April 11, 1894- Serial No. 507,170. (No model.) i

To aZZ whom it may concern.-

Be it known that I, JAMES P. ROE, a subject of the Queen of GreatBritain, residing at Pottstown,in the county of Montgomery and State ofPennsylvania, have invented certain new and useful Improvements in Yokesor Bridges for Manholes, Hand Holes, and Sludge-Holes of Steam-Boilers,Tanks, and the Like; and I do hereby declare the following to be afull,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to yokes or bridges for securing the covers orplates for manholes, hand-holes and sludge-holes of steam boilers,tanks, and the like,-in position, and it has for-its object to provide asimple, dura ble, comparatively inexpensive and a much lighter yoke orbridge for the purpose named than those now in common use, and itconsists in providinga yoke or bridge of Wrought iron or steel, stamped,pressed or rolled to a shape or form adapted to give the maximum ofstrength'with the minimum quantity of metal and in other details ofconstruction and arrangement of parts as hereinafter more fullydescribed and claimed. ,7

In the accompanying drawings forming a part of this specification-Figurel is a side elevation of one form of my improved yoke or bridge; Fig. 2a vertical section on the line .')cx, Fig. 1; Fig. 3 aside elevation ofanother form of yoke or bridge, Fig. 4 a vertical section on the liney-y, Fig. 3; Fig. 5 a

side elevation of still another form of yoke or.v

' bridge; Fig. 6 a verticalsection on the line zz, Fig. 5; Fig.7 avertical section through a man-hole cover or plate showing myimprovedyoke or bridge in cross section in p0- si-tion on a steam boiler, tankor other vessel; and Fig. 8 a vertical section of a man-hole cover orplate showing my improved yoke or bridge in longitudinal section inposition on iron are made very heavy in order to give them the strengthnecessary to enable them to withstand thepowerful pressure to which theyare subjected thereby rendering them difficult to handle and costly tomanufacture and, if made of steel, cast solid, what is gained inlightness of weight over cast iron is offset by the greater cost of pthe material. Now, it is my object, to provide a yoke or bridge for thepurposes named in which is combined the advantages of lightness inweight, great strength, and low cost of production, and this isaccomplished by making them of wrought iron or steel plates pressed,stamped or rolled the desired shape.

Referring to the drawings A represents my improved yoke or bridge which,in all the views, is represented in the usual arched shape inoutline,the differences between the several yokes or bridges shown being bestillustrated in the sectional views.

- Referring now to Figs. 1 and 2 it will be seen that the yoke or bridgeis formed by pressing, stamping or rolling with the depending sideflanges a thus making it, substantially, of an inverted U-shape in crosssection, and with a flat seat b, for the nut c which holds the bolt dinposition, to bear on,

a perforation or opening being formed in the yoke or bridge throughwhich the bolt extends. .The side flanges or extend from end to end ofthe yokeor bridge and decrease In Figs. 3 and 4 I show a yoke or bridgewhich is also of an inverted U -shape in cross section-,whose dependingside flanges a are bent at right angles, outwardly, to form the lateralflanges 6, thus providing an increased bearing surface for the ends ofthe yoke or bridge. The bridge or yoke shown in these figures is alsoperforated at its crown for the bolt, and may orv may not be formed witha seat for the nut.

In Figs. 5 and 6 I show the yoke or bridge .U-shaped in cross section,forming a channel by turning the side flanges a upwardly instead ofdown, in the bottom of which the perforation is formed for the bolt.Immediately above the perforation I connect the edges of the two sideflanges by a barf having a perforation therein which corresponds to andregisters with or is in line with the perforation formed in the channelbottom. The barf is secured to the yoke or bridge by forming grooves tocorrespond to the curvature of the yoke or bridgethereinfinto which theedges of the side flanges extend.

In Figs. 7 and 8 I show the form of yokeor bridge illustrated in Figs. 1and 2 applied to a man-hole cover or plate B in position on a boiler ortank 0 from which the arrangement of the parts when in use may bereadily understood. The bolt and plate shown in these figures possessnovel features which it is not necessary to describe here and for whichI have filed a separate application, of even date herewith, for LettersPatent.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. A yoke or bridge for man-holes,handholes, sludge-holes, and the like, consisting of a wrought iron orsteel, sheet or plate stamped, pressed or rolled the desired shape andwith side flanges, substantially as described.

2. A yoke or bridge for man-holes, handholes, sludge-holes and the like,consisting of a wrought iron orsteel sheet or plate, stamped, pressed,or rolled,the desired shape and with side flanges and with lateralflanges, substantially as described.

3. A yoke or bridge for man-holes, handholes, sludge-ho1es and the like,consisting of a wroughtiron or steel sheet or plate,stamped, pressed orrolled into a channel form and having a bar connecting the edges of saidchan- JAMES P. ROE.

Wit-nessesr WILLIAM F. LACHMAN, J. II. MAXWELL.

